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Applies to: Access 2013, Office 2013
Combines source-table records when used in any FROM clause.
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Syntax
LEFT OUTER JOIN. Another type of join is called a SQL Server LEFT OUTER JOIN. This type of join returns all rows from the LEFT-hand table specified in the ON condition and only those rows from the other table where the joined fields are equal (join condition is met).
FROM table1 [ LEFT | RIGHT ] JOIN table2 ON table1.field1compopr table2.field2
The LEFT JOIN and RIGHT JOIN operations have these parts:
Part | Description Apps are available on the App Store. Adobe Photoshop CC will be available on iPad in 2019. UI subject to change. Apple ipa pro. |
|---|---|
table1, table2 | The names of the tables from which records are combined. |
field1, field2 | The names of the fields that are joined. The fields must be of the same data type and contain the same kind of data, but they do not need to have the same name. |
compopr | Any relational comparison operator: '=,' '<,' '>,' '<=,' '>=,' or '<>.' |
Remarks
Use a LEFT JOIN operation to create a left outer join. Left outer joins include all of the records from the first (left) of two tables, even if there are no matching values for records in the second (right) table.
Use a RIGHT JOIN operation to create a right outer join. Right outer joins include all of the records from the second (right) of two tables, even if there are no matching values for records in the first (left) table.
Microsoft Sql Inner Join
For example, you could use LEFT JOIN with the Departments (left) and Employees (right) tables to select all departments, including those that have no employees assigned to them. To select all employees, including those who are not assigned to a department, you would use RIGHT JOIN.
The following example shows how you could join the Categories and Products tables on the CategoryID field. The query produces a list of all categories, including those that contain no products:
In this example, CategoryID is the joined field, but it is not included in the query results because it is not included in the SELECT statement. To include the joined field, enter the field name in the SELECT statement — in this case, Categories.CategoryID.
Note
- To create a query that includes only records in which the data in the joined fields is the same, use an INNER JOIN operation.
- A LEFT JOIN or a RIGHT JOIN can be nested inside an INNER JOIN, but an INNER JOIN cannot be nested inside a LEFT JOIN or a RIGHT JOIN. See the discussion of nesting in the INNER JOIN topic to see how to nest joins within other joins.
- You can link multiple ON clauses. See the discussion of clause linking in the INNER JOIN topic to see how this is done.
- If you try to join fields containing Memo or OLE Object data, an error occurs.
Example
This example:
Assumes the existence of hypothetical Department Name and Department ID fields in an Employees table. Note that these fields do not actually exist in the Northwind database Employees table.
Selects all departments, including those without employees.
Calls the EnumFields procedure, which you can find in the SELECT statement example.
I have three tables:
- Chapter (ChapterNo, Desc)
- Lesson (LessonNO, Dec, ChapterNo)
- Case (CaseNo, Desc, LessonNo)
As you see, the three tables are all connected. What I want is to return all the chapters (even without lessons in it), all the lessons (even without cases in it) and all the cases.
I am sorry to say but I really don't have an idea so I have no sample code. I hope my explanations are enough.
a_horse_with_no_name4 Answers
Sandip - Full Stack DeveloperSandip - Full Stack DeveloperUse Left Join query in order to get your desired result
Left Join In Sql Server
As for naming of tables. Don't use Case as table name because it is a reserved word for SQL.
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SELECT CH.ChapterNo,CH.Desc,LE.LessonNo,LE.Dec,CA.CaseNo,CA.Desc FROM Chapter CHLEFT JOIN Lesson LE ON CH.ChapterNo = LE.ChapterNo LEFT JOIN Cases CA ON LE.LessonNo = CA.LessonNO
Ms Sql Server Left Join Syntax
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